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Hi I'm Kevin it sounds like you have a missfire ignition coils are very common to fail on these and there was a recall on your model and if not already done should be replaced by bentley free of charge
If car is running rough it's likely caused by missfire it's not the amount of air you are feeling that's different it's the pressure caused by combustion /incomplete combustion
100%in the uk these were recalled USA ? But the same components are fitted
In the uk deffinatly (I'm located in the uk ) I don't have the info for USA so I can't say but normally it's across the board the cars were made using the same components regardless as to where they are sold
No worries let me know how you get on